To display animations with raster systems, animated objects (which may consist of graphical primitives such as lines, polygons, and so on) must be scan-converted into their pixmap in the frame buffer.

• 为了在光栅系统中显示动画，必须将运动物体(由如线，多边形这样的图元组成)经扫描转换变为可在帧缓存放的位图。